2008721971397 has 2 divisors, whose sum is σ = 2008721971398. Its totient is φ = 2008721971396.

The previous prime is 2008721971327. The next prime is 2008721971423. The reversal of 2008721971397 is 7931791278002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1979947295236 + 28774676161 = 1407106^2 + 169631^2 .

It is a cyclic number.

It is not a de Polignac number, because 2008721971397 - 2⁸ = 2008721971141 is a prime.

It is a super-2 number, since 2×2008721971397² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2008721971327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004360985698 + 1004360985699.

It is an arithmetic number, because the mean of its divisors is an integer number (1004360985699).

Almost surely, 2^{2008721971397} is an apocalyptic number.

It is an amenable number.

2008721971397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2008721971397 is an equidigital number, since it uses as much as digits as its factorization.

2008721971397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The spelling of 2008721971397 in words is "two trillion, eight billion, seven hundred twenty-one million, nine hundred seventy-one thousand, three hundred ninety-seven".